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Topic Review (Newest First)

05-30-2013 07:04 AM

timmfrit

i just bought a bernomatic oxy/mapp torch. ran out of oxy in the middle of a project. i too have a medical oxygen tank, it has a post on the top. it would be a great advantage to have a step down adapter from a bigger tank to the left handed disposable bottle male. that way you could still use the reg. if anyone knows how to do that, it would be greatly appreciated. if i find out i will post back.

06-04-2009 11:40 AM

crownver

I'm pretty sure the regulator set up is different on the medical bottle. If any one wants to know for sure I can look at it when I get back to town. I've still got the bottle and reg.

if the hookups are the same on medical oxygen tanks, a set of old medical regulators would work on a regular oxygen tank... medical regulators have a service life and old 1's out of service are easy to get

06-04-2009 09:09 AM

schnitz

Quote:

Originally Posted by crownver

I think you'd have to get the medical cylinders filled at a medical supply, and not sure what the cleaner oxygen would cost.

I might be wrong here (if I am, I'm sure oldred will school me....) , but I think it's one-in-the-same. Just as with the compressed oxygen for assisted respiration situations, there had better not be any particulates in the oxygen you weld/cut with either-- way too large of a chance of some debris plugging a tip.

In a while, Chet.

06-04-2009 12:50 AM

crownver

Before I got my oxy-acetylene torch going, a buddy gave me an oxy cylinder out of an ambulance. Worked well with the Oxy/Mapp gas set up I had. It didn't last all that long either, and I never had to fill it, because my kid started working for a welding gas supply company, and I get the gas filled real cheap, and he lends me tanks. I think you'd have to get the medical cylinders filled at a medical supply, and not sure what the cleaner oxygen would cost.

06-03-2009 11:18 PM

oldred

Quote:

Originally Posted by 86GMC

no reason why you cant just run propane and oxygen mixture. It is all I use, and is plenty hot to cut 1 inch plate with my rig.

It will cut OK and is cheaper to use than Acetylene but not only does Acetylene work better you can weld with it, something you can not do with Propane (you can however braze and solder with Propane). Acetylene is the most versatile of the available torch fuels and allows the user to do things he simply can not do with Propane, Propylene, Natural gas, etc.

06-03-2009 07:48 PM

86GMC

no reason why you cant just run propane and oxygen mixture. It is all I use, and is plenty hot to cut 1 inch plate with my rig.

06-03-2009 01:03 PM

schnitz

Quote:

Originally Posted by farna

Hence the acronym MAPP. Acetylene tanks have acetone in them, which absorbs the acetylene gas when under pressure, and easily releases it when depressurized. The acetone is also soaked into a fibrous material inside the tank, further stabilizing the mixture. Acetylene gas by itself is very unstable and can't be stored safely. MAPP can, and is much hotter than propane.

Thanks for the schooling, farna. Quite educational, and far less spam than the previous poster (rogerchang) had. Now, I'm glad to say I learned my new thing for the day.

In a while, Chet.

06-03-2009 07:31 AM

matt167

yea, theres adapters for them, I found them a while ago

06-03-2009 07:19 AM

farna

Hence the acronym MAPP. Acetylene tanks have acetone in them, which absorbs the acetylene gas when under pressure, and easily releases it when depressurized. The acetone is also soaked into a fibrous material inside the tank, further stabilizing the mixture. Acetylene gas by itself is very unstable and can't be stored safely. MAPP can, and is much hotter than propane.

The little outfits with the disposable cylinders are intended for hobbyists with small and/or infrequent jobs. If you rarely use the torch it takes quite a few of those $7.50 bottles to equal the cost of a filled oxygen cylinder ($90-$100 for the cylinder, $10-15 to refill, so let's go for the high of $115 -- $115/$7.50 = 15.33 small cylinders). The 20 cubic foot oxygen cylinders have to be tested or replaced every 10 years too, so there's a "shelf life". Every 10 years you have to swap it for a tested one at 1/2-2/3 the price of a new one. There's an equal shelf life/cost for the acetylene tank. Those $250-$300 outfits with "pony" tanks aren't filled, so add another $40-$50 to have them filled.

Is there an adapter so that the torch outfit can be used with a regular small oxygen cylinder? That might be the best of both worlds. Then you could use the MAPP gas (or even propane) with a regular oxygen bottle, since the oxy bottles are the biggest expense. I'm pretty sure there is (or used to be) an adapter. You don't normally see propane used with oxygen, but add oxygen to ANY flame and it will get hotter!

06-03-2009 01:01 AM

rogerchang

Mapp Gas

MAPP gas is a mixture of various hydrocarbonsmainly methyl ,acetylene,propylene and propane.It produces a relatively hot flame (2, 960°C)

09-13-2008 09:45 PM

old fords

Quote:

Originally Posted by oldred

Matt, Have you thought of the extra small "pony" tanks we call them for Oxygen and Acetylene? These are popular with plumbers and HVAC because of their compact size and they certainly are refillable about anyplace that fills gas bottles. You would not only have the economy of the refillable bottles but you would also have regular Acetylene and both tanks would last a heck of a lot longer, plus you would have the option of using a real cutting torch that would do anything the full sized outfits would do for short periods of time.

I agree with this. It seems like if you used it a good bit it would pay for its cost quickly since you wouldn't always be buying disposable bottles

09-12-2008 10:19 PM

matt167

I'v used oxycetelene torches b4, but only to cut simple things, and to heat and chill bolts to free them...

I bought 2 bottles of oxygen for the mapp gas torch because 1 of the nuts on the driver side strut rod of my '65 Rambler was really stuck.. 750 Ft/LBS impact wrench wouldn't crack it loose.. I tried, propane torches, all 3 that I have ( all diffrent tips ) and even tried them with just the mapp gas, but none of them worked good enough to break it free... so I fired up the Mapp torch, and got it loose..

it took 1.5 bottles of oxygen b4 I got the nut to move, and then the rest, was keeping it hot enough, to free it all the way.. then just enough oxygen left over to run a cutting test

09-12-2008 08:55 PM

oldred

With that little outfit and the right tips you could do anything from cutting an occasional piece of heavy steel to welding body panels. You could cut, braze, solder, weld or even heat parts to bend and even weld Aluminum or braze cast iron. Once you have an acetylene torch to use for a while and discover what you can do with it you will be lost without it!

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